Decoration of Au Nanoparticles on MoS<sub>2</sub> Nanospheres:
From Janus to Core/Shell Structure
Le Zhou
Hongwen Zhang
Haoming Bao
Guangqiang Liu
Yue Li
Weiping Cai
10.1021/acs.jpcc.8b01216.s001
https://acs.figshare.com/articles/journal_contribution/Decoration_of_Au_Nanoparticles_on_MoS_sub_2_sub_Nanospheres_From_Janus_to_Core_Shell_Structure/6099494
A flexible
route is presented for the controlled decoration of
the Au nanoparticles (NPs) on the spherical MoS<sub>2</sub> particles,
just by dropping the HAuCl<sub>4</sub> aqueous solution into the hydrothermal
reaction-induced MoS<sub>2</sub> colloidal solution at room temperature.
In the absence of surfactants in the colloidal solution, it has been
found that the obtained products are mostly the MoS<sub>2</sub>/Au
Janus particles, in which the hemispherical Au particles are separately
attached on the single MoS<sub>2</sub> spheres about 100 nm in size.
The hemispherical Au particles are built of the ultrafine NPs (<10
nm) and comparable to the MoS<sub>2</sub> spheres in size. Further
experiments have revealed that the existence of surfactants in the
colloidal solution could significantly influence the distribution
and decoration of Au NPs on the MoS<sub>2</sub> nanospheres. When
the MoS<sub>2</sub> colloidal solution contains the nonionic or anionic
surfactant, such as poly(vinylpyrrolidone) and sodium dodecyl benzene
sulfonate, in appropriate content, the addition of HAuCl<sub>4</sub> induces the Au ultrafine NPs highly uniformly attached or decorated
on the MoS<sub>2</sub> spheres. The distribution of the Au ultrafine
NPs on the MoS<sub>2</sub> spheres evolves from a dispersed decoration
to the intact core/shell structure with the rising HAuCl<sub>4</sub> addition amount. However, the cationic surfactant could prevent
Au NPs from decoration on the MoS<sub>2</sub> spheres and induce the
self-agglomeration of Au NPs. The formation of MoS<sub>2</sub>/Au
Janus particles is attributed to the aggregation growth of Au ultrafine
NPs on the MoS<sub>2</sub> spheres, whereas the dispersed decoration
of Au ultrafine NPs on the MoS<sub>2</sub> spheres is ascribed to
the surfactant-induced uniform distribution of Au NPs. Interestingly,
such decorated spherical MoS<sub>2</sub> NPs have exhibited a much
higher surface-enhanced Raman scattering effect than the decorated
MoS<sub>2</sub> nanoplates. This work presents a simple approach to
the controllable decoration of Au NPs on the spherical MoS<sub>2</sub> particles.
2018-03-26 00:00:00
MoS 2 nanospheres
MoS 2 NPs
HAuCl 4 addition amount
decoration
Janus particles
MoS 2 spheres
HAuCl 4
surfactant-induced uniform distribution
MoS 2 nanoplates
sodium dodecyl benzene sulfonate
MoS 2 Nanospheres
hydrothermal reaction-induced MoS 2
MoS 2 particles
ultrafine NPs